Fastener applying implement



FASTENER APPLYING I MPLEMENT Filed May.24, 193'? 2 sheetssnem 1 M h l @IC 4, 1939 l v A. H. MAYNARD 2,150,332.

FASTENER APPLYING IMPLEMENT "iii: "g x fi Patented Mar. 14, 1939 PATENT OFFICE 2,150,332 FASTENER APPLYING nvrPLEnmN'r Arthur H. Maynard, Warwick, R.- I., assignor to Boston Wire Stitcher Company, Warwick, E. I., a corporation of Maine Application May 24, 1937, Serial No. 144,340

7 Claims.

This invention relates to fastener-applying implements and more particularly to a safety device for such implements which operates to prevent the fasteners from being jammed and deformedA or damaged during a relling or loading operation.

1n one known type of fastener-appying implement a rell stick or charge of fasteners is supplied to the magazine .at its fiforward end by sliding them onto a coreV therein. In this type of implement a pivoted gate is rocked to open the forward end of the magazine and a stick of pre` formed fasteners held together by an adhesive` is forced rearwardly into the'magazine against the forc of a spring-pressed pusher. As the magazine becomes fully loaded the pusher is forced beyond the end of the core in the magazine soA that when the .gate is closed the fasteners'ai'e jammed, between the pusherand" gate. Consequently the stick of fasteners isrsubjected to considerable pressure which may cause it to buckle and the fasteners to ride up one on another, or to be .otherwise jammed and deformed so that in subsequent use they are liable to vcausev clogging in the magazine or the throat through which they are driven. l

One of the objects of thepresent invention is to provide van implement of the type indicated having a magazine with means for preventing jamming or damaging the fasteners by lling the magazine beyond its normal capacity.

Another object of the invention is to provide an'implement of the type indicated having a yieldable4 stop or abutment engaged by .the pusher .to indicate when-the magazine is fully loaded and f or door at the forward -end of the magazineA to v,

permit fasteners to be supplied theretoand a rep siliently pressed stop at the rearward end of the magazine adapted to yield to compensate for the final movement of the gate to closed position.

Still another object of. the invention is to provide an implement of the type indicated of simple and compact constr\uction, eilicient for'performing its intended functionsfand adapted for use through alined 'apertures'in depending anges I2 over longv periods of timewithout repair or re.

placement of its parts.

Further objects of the improvement are set forth in the following specification'which destick of fasteners in the magazine and projecting beyond the forward end thereof;

.Fig. 3 is a view similar toFig. 2 showing the gate closed and the' yielding abutment or stop moved rearwardly by .the pusher to adapt the magazine to accommodate the fasteners which project forwardly beyond its end;

Fig. 4 is a detailed perspective view of the rearward end of the magazine-core showing the abutment or stop yieldingly held in its normal poe sition on the core;

Fig. 5 is a View similar to Fig. 4 showing the abutment engaged by the pusher and moved rearwardly to increase the capacity of the magazine; and i Fig. 6 is a transverse sectional view on line 'sj-s of Fig. 1 showing the construction of the magazine-arm.

, The'yieldable stop or abutment constituting the subject of the present invention is illustrated in the drawings as' applied to an implement ofthe type illustrated and described in the United States Letters Patent No. 2,037,334 to A. I-I. Maynard, issued April lll, 1936, and employed for applying U-'shaped staples to the work. It is to be understood, however, that the invention may be' applied to other types of implements or to similar implements for applying other forms of fasteners. Y

.Thestapling implement as herein illustrated comprisesv a base. 2f preferably constructed of sheet-metal shaped to form a generally at rec.-

. tangular top plate 3 bounded by a depending bevf eled flange 4. Suitable rubber pads 5 are provided at opposite ends of the base. to prevent it vfrom marring the finished surface of 'a desk top or the like on which it supported. A clinchervanvil 6 'is suitably attached to the flat top-porhinge-block 'l is provided at the rearwardend of the base for pivotally mounting the staplingor magazine-arm l0 thereon. The block 'l is flxedly secured to the bate 2 and has a transverse hole for receiving .a hinge-pin Il lwhich extends on the-arm I0 to pivotally mount the latter. The

.tion 3 of the base 2 at its forward en'd, while a arm I is normally held in raised position as illustrated in Fig. 1 by a leaf-spring I3 fastened at one end to the bottom of the iiat portion 3 of used in the implement with its interior provided with a longitudinally-extending staple support or core I6. The core I8 is of inverted U-shape to adapt it to support staples s straddled across its top and is flxedly secured to the member I by welding or other means. Flanges I1 suitably secured to the sides of the channel-member I5, as by welding, overlle the top' of the core i3 to form guides for holding the staples in position on the core I5. The forward end of the staplingor magazine-arm I Il is normally closed by. a U- shaped door or gate 20 hingedly mounted thereon. A pin 2I having its ends fixed in the side walls of the gate 2U extends through elongated slots 22 in the sides of the arm Iii to mount the gate thereon and provide for its manual operavtion to open and close the endV of the magazine.

Notches23 are formed in lower edges of the side walls of the gate 20 for co-operation with lugs 24 on the arm I0 to latch the gate in ,closed position. When the gate 20 is closed its front wally cooperates with the end of the staple-core I5 toform a throat or chute 25 through which the staples are driven. A spring 26 bears at its end against the pin 2| to yieldingly hold the notches 23 in the gate 20 in latched engagement with the lugs 24, see Figs. 2 and 3. The gate 20 is opened by raising` it against the action of the spring 25 to release its notches 23 from the lugs 24 and then rocking the gate with the pin 2i acting as a pivot.

A staple-driver 30 positioned in the throat 25 is adapted to be reciprocated to drive staples advanced along the core I 5v into position beneath the driver. The driver 30 is detachably connected to a lever 3i which overlies the arm I0. As herein illustrated, the lever 3| is of a hollow construction with its sides overlapping and enclosing the sides of the arm IU. The rearward end of the lever 3l is pivoted on a pin 32 passing through the sides of the arm IIJ. A pad or finger-,piece 33 is provided at the forward end of the lever 3I for pressing the arm I0 toward the base 2 and thereafter rocking the lever about its pivot-pin 32 to reciprocate the driver 30 and drive the staples s through the throat 25.

The staples s are-advanced along the core I5 and into the throat 25 by a slidable staplepusher 35. The pusher 35 is of inverted U-shape construction toladapt it to fit closely about the core I5 at the rear of the staples s. A spring 35 has one end connected to an upstanding lug 31 on the pusher 35 and extends forwardly around a suitable cross-strut 33 and then rearwardly with its opposite end connected tofa yoke 35 which embraces the pin 32. The spring 35 thus acts to yieldingly urge the pusher 35 forwardly to successively advance the staples s into the throat 25. l

Astaple-retainer40 is provided on the arm I0 for engaging the staples s to prevent them from being ejected from the magazine by the pusher 35 when the gate 20 is opened; whilealso being' adapted to yield to permit a stick of the staples vto slide thereunder when the magazine is being lrearwardly in the magazine.

reillled. The retainer 4I) is pivotally mounted on a cross-pin 4I extending between the side walls` of the channel-member I5 and has a pointed beak 42 which is adapted to engage the staples in the magazine through an opening 43 between the flanges I1, see Fig. 2. The retainer 40 is held in either one or the other of two positions by a hairpin spring 44 connected to the arm III at one end and having its opposite end pivotally connected to the retainer.

In accordance with the present invention the rearward movement of the staple-pusher 35 is limited by its engagement with a yielding stop or abutment 50'. In the present embodiment of the invention, as shown most clearly in Figs. 4 and 5. the abutment or stop-member 50 comprises a sheet-metal plate bent toA channel-form to provide depending flanges 5I and 52 and a laterallylextending wing 53. The side ilange 5I engages one side of the core I5 while the opposite ilange` ing on 'the core by the flanges I1 which overlie its top and the'lateral wing 53. The forward end of the ange 52 is yieldingly heldin engagement with the forward end of the slot 54 by means of a spring 55 within the core I6. The spring 55 has a hook 56 at one end which engages a suitable recess 51 in the wing 53 and the opposite end of the spring is connected to a depending lug 53 cut away from thetop of the core' I5 andbent downwardly therefrom.v The spring 55, being thus positioned beneath the top ofthe hollow core I5, cannot interfere with the normal operation of the pusher 35. With the form of abutment 50 as herein illustrated` the forward edge of its channeled portion and the laterally-extending w\ing 53 provide offset shoulders 5|) and 5I which are engaged by correspondingly-shaped oifset shoulders 52 and 53 on the pusher 35. The

`methodoi.' operation of the complete device is as next explained." A v To the load the magazine in the arm I0 with'a refill of staples s the gate 2li is ilrst lifted and then rocked on its pivot 2i to open vposition as illustrated in Fig. 2. The rell stick oi staples s may then be inserted in the magazine at its forward end and slidrearwardly on the core I5 be- `their movement outwardly from the magazine urder the action of the spring 35 and staplepusher 35. adjacent the forward end'f the magazine-arm and thel gate 25 is`then rocked about its pivot 2l to its closed position shown in Fig. 1.

Should the end of the rell stick project beyond the end yoi the core as indicated in Fig. 2, the foremost staple is engaged by the front wall of the gate 20 as the latter is rocked to its closed position which thereby forces the staple-stick This motion is transmitted lto the staple-pusher 35 and due to the engagement of its shoulders 62 and 53 with the shoulders GII and 6I on the abutment 50 the The refill stick of staples is broken- 60 fore, without limiting myself latter is caused to be moved rearwardly to a limited extent toincrease the capacity of the magazine whereof to accommodate the few additional staples. The spring 55 yields to permit this 5 limited rearward movement of the abutment 50 so that the combined action of the springs 55 and 3'6 thereafter urges the pusher 35 forwardly. Due to the yielding action of the spring 55 the staple-stick is prevented from being buckled and the staples from being deformed or otherwise damaged so that subsequent lclogging in the throat'25 is obviated.

The closing of the gate 2l] rocks the retainer 40` to release its beak 42 from engagement with the staples s sothat the pusher 35 may thenadvance the staples forwardly in the magazine-arm ID. The foremost staple is thus positioned in the throat 25 beneath the driver 30 and when the lever 3l is depressed relatively of the arm I0 the driver shears the staple from the stick and drives it downwardly through the throat. The lever 3i is then returned to the position shown in Fig. 1 by a suitable spring, not herein shown, to raise .the driver 30 above the staple-corey I6.

staple-pusher 35 then acts under the tension of the spring 36 to advance the staples forwardly in l the magazine-arm l to position another staple beneath the driver to be driven in the manner as rst explained. During the advance of each successive staple into driving position the abutment 50 is moved forwardly bythe spring 55 until eventually the forward end of the depending ange 52 engages the forward end of the slot 54 in the core i6. The abutment 50 is then prevented from further forward movement and the stapless are advanced successively by the pusher 35 until the supply is exhausted. A new stick of staples may then be supplied to the magazinearm il! in the manner as above explained, the engagement of the pusher 35 with the abutment 5d indicating when theV magazineis fully loaded and the abutment yielding to accommodate a few additional staples on the stick which may project forwardly beyond the -end of the core I6.

It will be observed that the yielding abutment in the magazine acts to enlarge its capacity to prevent jamming or deformation of staples dur- 1 ing a refilling or loading operation. It will further be observed thatI the yielding abutment is of simple and compact structure, adapting it for and illustrated as embodied in a preferred form Q of construction, it is to be understood that vari- /ous modifications may be made in the structure and arrangement of its parts without departing from the spirit or scope of the invention. Therein thisV respect, I

claim:

1. In fastener-applying implement, a magazir; .for hold'mg a supply of fasteners, a pusher for feeding the fasteners from the magazine, means for actuating the pusher to advance the fasteners in the magazine, astop adapted to be engaged by the pusher when a predetermined number of fasteners are placed in the magazine, and resilient means acting on said stop to adapt it to yield to increase the normal capacity of the magazine.

2.- In a fastener-applying implement, a magazine having a c ore for supporting a series of fasteners applied to the core at its forward end, a

'15 pusher slidable on the core, means for actuating The the pusher to advance the fasteners along the core, an abutment adapted to be engaged by the pusher during its rearward movement when a predetermined number of fasteners are placed in the magazine, and resilient means acting on the abutment to adapt it to yield when the number of fasteners supplied exceeds the normal capacity of the magazine.

3. In a fastener-applying implement, .a magazine for holding a supply of fasteners, a pusher slidable in the magazine for advancing the fasteners to feed them therefrom, a spring for actuating the pusher to `advance the fasteners in the magazine an abutment in the magazine adapted to be engaged by the pusher when the fasteners are placed in the magazine, means to permit loading of the magazine,` and a spring cooperating with the abutment to adapt the latter to yield when the supply of fasteners is greater than that normally allowed beween the abutment and the end of the magazine.

4. In a fastener-applying implement, a magazine for holding a supply of fasteners, a pusher slidable in the magazine, means for actuating the pusher to advance the fasteners in the magazine, means for opening one-end of the magazine to insert the fasteners thereinto, and yieldable means means engaged by the pusher when a predetermined number of the fasteners are placed in the magazine, said last-named means yielding to increase the capacity of the magazine to accommodate additional fasteners.

5. In a fastener-applying implement, a magazine for-holding a supply of fasteners, a core in the magazine for supporting the fasteners, agate at the forward end of the magazine cooperating with the core to form a throat through which the fasteners are driven, said magazine being loaded 4 gate is moved to closed position and the number of fasteners inserted exceeds the normal capacity of the magazine. s

6; In a stapling or wire-stitching'machine, a magazine for holding a supply of preformed staples, a pusher slidable in the magazine to advance the staples therein, a hinged gate at the end cf the magazine operable to permit staples to be supplied thereto, and yieldable means for engaging the pusher when a predetermined number of staples are placed in the magazine to limit itsy movement wl. ile preventing the staples from being jammed or deformed by the closing of the gate when the supply of staples is greater than the normal supply and extends slightly beyond the magazine at the gate end.

7. In a fastener-applying implement, a magazine for holding a supply of fasteners inserted at its forward end, means foradvancing the fastenersin the magazine to feed them therefrom, and yieldable means in the magazine independent of the feeding means and engageable by the latter during its rearward movement when fasteners are placed in the magazine, said last-named means yielding to prevent buckling or deformation of the fasteners when the number of fasteners supplied exceeds the normal capacity of the magazine.

ARTHUR H. MAYNARD. 

